Improvement in dovetail-machines



2 Sheets-Sheet1..

A. C. VAN ALSTIN E. Dovetailing Machines.

Patented July 22,1873.

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AM. PHoTa-umoaRA/H/c 0a MX(osaum/sfs Pfeacass) 2 Sheets--Sheet 2.

A. C. VAN ALSTINE.

Dovetailing Machines. l l N0 141,096, Parenledluly 22,1873.

l ll Per Attorneys.

AM. PHoTo-L/rHomm/c co. MHOSBaRNEI moans) UNITED STATEs PATENT OFFICE.

ALFRED c. VAN ALsTiNE, oE'NEw YORK, N. Y.

IMPROVEMENT IN DOVETAILfMACHINES.

Specification forming part of Letters Patent No. 141,096, dated July 22,1873; application filed Aprn 5, 1873.

To all whom it may concern:

Be it known that LALERED C. VAN ALsTINE, of the city, county, and Stateof New York, have invented a new Improvement in Dovetail-Machines, ofwhich the following is a speciiication:

The invention consists in the improvement of tenoning andsash-dovetailing machines, as hereinafter described and pointed out inthe claims.

Figure 1 is a plan view of my improved machine. Fig. 2 is a longitudinalsectional elevatlon of the carriage taken on the line a' x of Fig. 1,and side elevation of a portion of the machine on an enlarged scale.Fig. 3is a sectional elevatiou of the machine on the liue,

Fig. 1. Fig. 4 is a side elevation of some of the parts. Fig. 5 is aside elevation of part of a tenoning-cutter, also part of a do'vetailingcutter and a stile. Fig. 6 is aside elevation of part of atenoning-cutter, also part of a dovetailing-cutter and a check-rail; italso shows a cope-cutter in dotted lines. Fig. 7 is a section of Fig. 6on the line y y. Fig. 8 is a perspective view of a stile and checkrail,jointed together by tenons and notches formed with the machine.

rlhis machine is mainly arranged like an ordinary tenoningmachine, witha tenoninghead, A, on the frame A1, also a tenoninghead, B, on the upperframe B1, in such a way that it overhaugs said upper frame, which ismade narrower than frame A1 for that purpose. The head B is detachablysecured to its shaft by meansof a set-screw, to be taken off atpleasure. Next to headA is a copehead, C; next to cope-head C is adovetailer, D, which is set as close to cope-head C as it can be and runclear; it is mounted on a bar, D1, which is pivoted at D2 to the machinein such a manner that it can be set perpendicularly, or inclined byswinging the bar on its pivot. E is another dovetailer, which is set farenough from D to allow the check-holder to tip over while passingbetween them, as hereinafter described. The dovetailers are driven bybelts from the upright shaft J. K L represent ways, upon which thecarriage M is placed. 0n the side of way K is a groove or slot, Q,which, at T, branches down with a quick turn, and at S branches up witha long incline until the desired point is reached that will give thedovetail to the tenon of the check-rail, as hereinafter described; thenthe two branch slots F and I continue on parallel with each other. At Rare two cog-wheels, set back of the 'pieces that form the slotsaforesaid 5 said wheels have sixteen teeth. On each of said wheels isaratchet-wheel, a, with eight teeth; these ratchet-wheels are set sothat the teeth on one will point to the center of a space between theteeth of the other at the plane of their axes. Just below and betweenthe ratchet-wheels is a post or vergepin, bf, on which is a sleeve ortube. To said sleeve or tube is fastened the verge or arms c d', whichreach the ratchet-wheels, so that when the wheels are moved they give tothe verge an escapement-motion. On the outer end of said sleeve is atongue, r1", which, when in use, will close one of the intersectingslots and open the other. On the top of the way K is a sliding pawl-bar,3, on which is a pawl, 4, that engages with one of the cogwheels R. At Uis a spiral spring, arranged in the way to act on a pin, 2, in thepawl-bar. The ways K L rest on inclined planes e', and are raised orlowered by means of the screw Z, by which said inclined planes areadjusted.

The carriage M has a gage-bar, W, on the end of which is a stop, X; italso has a rocking angle-bar, V, which is secured to the rocking shaft1, in which is a linger-bar, N; at Y is a button on the carriage.

To operate this machine for dovetailing sash-Stiles, the carriage M israised by means of the inclines e and screw Z, so that the sash-stile,when laid on the carriage M, will be above and clear of the head A andcope C; the head B is then set so as to cut the stile A1, Fig. 8, to therequired thickness, as at a the dovetailer D is then set so as to givethe dovetail or diagonal cut, as at b thel dovetailer E is set so as tocut the last part of the dovetail mortise, as at c then the stop X isadjusted to give the ldepth of cut required; the stile is then put onthe carriage M, against the gage-bar W, and passed through, and isfinished at each end by one operation. The stiles for the bottom sashare run with the face of the stu down, and the stiles for the upper sashare run with the face up.

To operate this machine for forming checkrails B2, the head B isremoved; the carriage M is let down so that the head A will cut theshoulder g the required depth 5 the dovetailer D is set perpendicular,and adjusted to cut out for the lip at d, so as to fit over the stile,where it is taken to the required thickness, as a; the dovetailer isadjusted so as to cut the dovetail side of the tenon, as ate the stop Xis drawn back; the finger-bar N is put in the slot Q, and secured to therocking shaft l; and the button Y is thrown over so as to catch the pin2 0n the sliding pawl-bar 3. The machine is now set in motion, and thecheck-rail is put on the rocking bar V, with the work edge down and faceside from the operator, who

stands at the left-hand side of the machine,

as represented in the drawing; itis then passed over the head A, theshoulder g is cut, and the parallel side of the tenon is made; next, thecope C cuts the shape, 7a, for the head or other molding on the sash;the dovetailer D then cuts out for the lip, as at d, and after it passesclear of the dovetailer D the linger-bar N drops down in the slot I, andthrows the rocking bar V from the operator; then the dovetailer E cutsthe dovetail side c of the tenori; this completes one end of thecheckrail. The carriage M is then drawn back till the finger-bar N haspassed the tongue T4; at the same time the button Y catches the pin 2,and carries the pawl-bar 3 back with it just far enough so that the pawl4 will move the Wheels R just one tooth; this throws the tongue T' down,and closes the slot I, and opens the slot F. Then theother end of thecheck-rail is put through, the same as before, and when the finger-barNreachesthe tongue T it turns up into the slot F, and tips the rockingbar V toward the operator; this gives the dovetail c to theY tenon, asrequired, and finishes the check. When the carriage M is moved forwardthe pin 2 is released from the button Y 5 then the spiral spring Uthrows the pawl-bar 3 back, so that the pawl 4 drops back of the nexttooth; this is for checks for the bottom sash. All the change that isrequired for top checks is to throw oii' the copeelt.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. The combination of the tongue T', escapement c d',ratchet-wheels a', cog-Wheels R, pawl 4, and pawl-bar 3, with thebranched guide'slot and the carriage M, substantially as specified.

2. The combination of the ngerbar N of the tilting bar V, branchedguide-slots Q F I, tongue T', Iand automatic devices for shifting thetongue.

ALFRED C. VAN ALSTINE.

Witnesses T.` B. MOSHER, ALEX. F. RoBnR'rs.

